5

I am wondering what is the difference between:

# ifconfig eth0:0 1.1.1.1/24

and just

# ip addr add 1.1.1.1/24 dev eth0

Btw I cannot do

# ip addr add 1.1.1.1/24 dev eth0:0
RTNETLINK answers: File exists

In ip addr show it appears differently :

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 
link/ether 8c:ae:4c:fe:1f:75 brd ff:ff:ff:ff:ff:ff
inet 1.1.1.1/24 brd 1.1.1.255 scope global eth0:0 ---> with ifconfig
inet 2.2.2.2/24 scope global eth0 ----> with ip

When should I prefer the first way and when should I prefer the second way? It seems more cool to

3
  • On Linux you should always prefer the iproute2 tools (like ip) and avoid the net-tools (like ifconfig), net-tools are deprecated. This does not hold true for other operating systems, though. For information in the thread net-tools future.
    – Marco
    Aug 22, 2013 at 21:32
  • 1
    I know it is deprecated, I was just wondering if the two commands has the same result or not. Thanks for the thread is looks interesting. Aug 22, 2013 at 21:38
  • 4
    If you insist on labels you can do it with ip as well: ip addr add 1.1.1.1/24 label eth0:0 dev eth0
    – dsmsk80
    Aug 23, 2013 at 7:00

1 Answer 1

5

In Linux, use the ip commands. In other OSes, use ifconfig and family.

If you use the iproute2 way (ip) as such:

ip addr add 1.1.1.1/24 dev eth0 label eth0:0

you should have the same effect as your first ifconfig command, and should even be displayed the same way by ifconfig. As mentioned, in Linux, you should prefer the ip family of commands over ifconfig, route, etc. Though ifconfig and others will remain a stable in network admin's diets for a while to come because of their wide usage and support in non-Linux OSes as well.

1
  • I am exploring this option, could you please share how to make this rule persistent. I tried creating new interface file with the name eth0:0 but doesn't work. Jul 2, 2021 at 4:41

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